Screw holding screw driver



Oct. 19, 1948. J, SOPCAK 2,451,696

SCREW HOLDING SCREW DRIVER Filed Dec. 1, 1944 2 Sheets-Sheet 1 lWjfchaeZ QI/S bppak,

Inventor.

WWW E Oct. 19,1948. M; 50 2,451,696 v SCREW HOLDING SCREW DRIVER I v v Filed Dec. 1, 1944 2 Sheets-Sheet 2 Inventor,

modate the screw-threaded plug portion IQ of a closing plug 20, the latter being provided on its interior with an end thrust button 2| axially arranged.

The main part of the screw lock or screw starter is shown in Figure 5. This can be 'unitarily referred to as an oscillatory plunger 22. It has a reduced stem or rod portion 23 which extends down through the bore in the shank and terminates in a bit 24 which works back and forth between the spaced bits l as shown in Figures 7, 8, 9 and 12. The upper end of the rod as indicated at 25 is slightly enlarged to accommodate the coiled spring 26, the spring having its lower end anchored in a hole 21 formed in said part 25, the latter is provided at its top with a notch 28 to accommodate a small screw-driver for tensioning the spring 26. The spring is a compressional as well as torsional element and its upper convolutional end is bent laterally and anchored in a notch 29 in a ring or washer 30,

.the latter arranged in the upper end of the handle and held in place by a set-screw 31 (see Figure 2). Thus, the coil spring surrounds the part 25 and rests at one end against the washer 3E The opposite end rests against the disk like portion 32 or shoulder formed on the plunger. The underside of the disk-like portion'is of a tapered 0r conical form as indicated at 33 to cooperate with the accommodation seat IS. A finger-grip comprising a button 34 has its shank threaded into the periphery of the shoulder 32, said shank working back and forth in an arcuate slot 35 provided in the handle.

The spring 26 exerts a torsional twist and the tension of this can be regulated. In doing this the plug 28 is removed and the screw-driver is placed in the slot 28. The finger-grip 34 is re moved from the slot 35. Then the spring is wound up, so to speak, with the screw-driver until the desired number of turns have been-made. By registering the socket in the periphery of the part 32 with the slot 35 the operating fingerpiece 34 is replaced to maintain the parts properly assembled and tensioned.

In practice, the three bits 15, 24 and [5 are arranged in aligmnent with each other as shown in the so-called neutral position in position in Figure 7. This is done by moving the finger-grip 34 so as to line up the several bits whereupon they are shoved down and into the kerf of the screw 11. Then, by releasing the finger-grip 34 the spring means comes into play and cents or twists the central bit 24 which becomes a locking element. This kicks the other bits over into the slot of the screw as shown in Figure 8 for driving purposes. An alternative shift of parts is made by shifting the bits to the other position as seen in Figure 9 for unthreading. Conse quently, the oscillatory look, under spring torsional compression serves to definitely engage the end of the screw-driver with the kerf in the screw, holding the screw thereon for either inserting or removing during the starting step.

The complete operation can be made with the device as a screw-driver or a separate screwdriver can be employed for heavy duty work. It is primarily a starter.

It is thought that persons skilled in the art to V scription is regarded as unnecessary.

Minor changes in the shape, size and arrange- 4 ment of details coming within the field of invention claimed may be resorted to in actual practice, if desired.

I claim:

1. A screw-driver of the class described comprising an elongated hollow cylindrical handle open at its normally upper end, the opposite end of said handle being circumferentially tapered and defining a correspondingly tapered end portion for the bore merging into a centrally positioned and reduced hollow neck, a screw-driver shank fitted into and secured in said neck, said shank having a central bore extending entirely therethrough, the outer end of said shank terminating in opposed kerf-engaging main bits, a plunger device, embodying an enlarged disc-like shoulder having aconicai portion rotatably engaging the tapered end portion of the bore of said handle, having an integral stem extending downwardly from said shoulder and rotatably through the bore in said shank and terminating at its outer end in an auxiliary bit arranged between the first named main bits, said handle having an arcuately extending slot formed in the side, a

. finger-grip exteriorly disposed in respect to said handle and having a part extending interiorly into the handle by way of said slot and removably connected with a marginal portion of said shoulder, said stem having an enlarged integral upper end located and confined in said handle and projecting above said shoulder and having at its upper end a notch to accommodate a screwdriver, spring. abutting and anchoring means fixedly mounted in the upper end portion .of

said handle, the enlarged portion of said stem being slidably and rotatably mounted in and extending above said means, and a coiled torsional spring confined in said handle and surrounding the enlarged portion of said stem, one end of said spring bearing upon said shoulder and being anchored on said stem and the other end portion of said spring bearing against said means and being anchored on the latter means.

2. A screw-driver ofthe class described comprising an'elongatedhollow cylindrical handle having a bore internally screw-threaded and open at its normally upper end, the opposite end of said handle being circumferentlally tapered and defining a correspondingly tapered end portion for the bore and merging into a centrally positioned and reduced hollow neck, a screwdriver shank fitted into and secured in said hollow neck, said shank having a central bore extending entirely therethrough, the outer end of said shank terminating in opposed kerf-engaging main bits, a plunger device, embodying an enlarged disc-like shoulder having a conical portion rotatably engaging the tapered end portion of the bore of said handle, having an integral stem extending downwardly from said shoulder and rotatably through the bore in said shank and terminatingat its outer end in an auxiliary bit arranged between the first named main bits, said handle having an arcuately extending slot formed in the side, a finger-grip exteriorly disposed in respect to said handle and having a part extending interiorly into the handle by way of said slot andremovably connected with a marginal portion of said shoulder, said stern havingan enlarged integral upper end located and confined in said handle and projecting above said shoulder and having at its upperflend a notch to accommodate a screw-driver, aicoiled spring abutting and anchoring washerfixedly mounted in the upper end portion of said handle,

a 6 the adjacent notched end portion of said stem extending slidably and rotatably through and above REFERENCES CITED the washer, a coiled torsional spring confined in Th f l w n ref ren re of r r in the said handle and surrounding the enlarged porfile Of this Patent! P1011 ofsaid stem, one end 0 1 said spring bearmg upon said shoulder and being attached to said stem and the other end of said spring bearing Number Name Date against said Washer and being secured to said 1,063,304 Tltus J1me 3, 1913 washer, and a screw plug threaded into the 212501736 Torresen July 1941 screw-threaded end portion of the handle above 10 FOREIGN PATENTS the notched end of said stem.

I Number Country Date MICHAEL J. SOPCAK. 224,028 Great Britain Nov. 6, 1924 

